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A study of rare earth element (REE)–SiO2 variations in felsic liquids generated by basalt fractionation and amphibolite melting: a potential test for discriminating between the two different processes

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Abstract

The origin of felsic magmas (>63% SiO2) in intra-oceanic arc settings is still a matter of debate. Two very different processes are currently invoked to explain their origin. These include fractional crystallization of basaltic magma and partial melting of lower crustal amphibolite. Because both fractionation and melting can lead to similar major element, trace element and isotopic characteristics in felsic magmas, such lines of evidence have been generally unsuccessful in discriminating between the two processes. A commonly under-appreciated aspect of rare earth element (REE) solid–liquid partitioning behavior is that D REE for most common igneous minerals (especially hornblende) increase significantly with increasing liquid SiO2 contents. For some minerals (e.g., hornblende and augite), REE partitioning can change from incomptatible (D < 1) at low liquid SiO2 to compatible (D > 1) at high liquid SiO2. When this behavior is incorporated into carefully constrained mass-balance models for mafic (basaltic) amphibolite melting, intermediate (andesitic) amphibolite melting, lower or mid to upper crustal hornblende-present basalt fractionation, and mid to upper crustal hornblende-absent basalt fractionation the following general predictions emerge for felsic magmas (e.g., ∼63 to 76% SiO2). Partial melting of either mafic or intermediate amphibolite should, regardless of the type of melting (equilibrium, fractional, accumulated fractional) yield REE abundances that remain essentially constant and then decrease, or steadily decrease with increasing liquid SiO2 content. At high liquid SiO2 contents LREE abundances should be slightly enriched to slightly depleted (i.e., C l/C o ∼ 2 to 0.2) while HREE abundances should be slightly depleted (C l/C o ∼ 1 to 0.2). Lower crustal hornblende-bearing basalt fractionation should yield roughly constant REE abundances with increasing liquid SiO2 and exhibit only slight enrichment (C l/C o ∼ 1.2). Mid to upper crustal hornblende-bearing basalt fractionation should yield steadily increasing LREE abundances but constant and then decreasing HREE abundances. At high liquid SiO2 contents LREE abundances may range from non-enriched to highly enriched (C l/C o ∼ 1 to 5) while HREE abundances are generally non-enriched to only slightly enriched (C l/C o ∼ 1 to 2). Hornblende-absent basalt fractionation should yield steadily increasing REE abundances with increasing liquid SiO2 contents. At high SiO2 contents both LREE and HREE are highly enriched (C l/C o ∼ 3 to 4). It is proposed that these model predictions constitute a viable test for determining a fractionation or amphibolite melting origin for felsic magmas in intra-oceanic arc environments where continental crust is absent.

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Notes

  1. This study uses the definition of Leat and Larter (2003) wherein an intra-oceanic arc is any arc that does not overlie basement consisting of continental crust. This would include arcs such as Tonga-Kermadec, Vanuatu (New Hebrides), Solomon, New Britain, Ryukyu, Mariana, Izu-Bonin, central and western Aleutian, Lesser Antilles, and South Sandwich (Scotia). By definition it could also include the Cost Rican segment of the Central American arc, the Phillipine archipelago and the central Kurile arc.

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Acknowledgments

The author wishes to thank Susan Debari for a wonderfully thorough and critical review of an earlier version of this paper, and Tom Vogel for providing published and unpublished data that helped immeasurably in verifying the predicted REE-SiO2 variations for the case of lower crustal amphibolite melting.

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  1. Department of Geological Sciences, Indiana University, 1005 East 10th Street, Bloomington, IN, 47401, USA

    James G. Brophy

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Correspondence to James G. Brophy.

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Communicated by T. L. Grove.

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Brophy, J.G. A study of rare earth element (REE)–SiO2 variations in felsic liquids generated by basalt fractionation and amphibolite melting: a potential test for discriminating between the two different processes. Contrib Mineral Petrol 156, 337–357 (2008). https://doi.org/10.1007/s00410-008-0289-x

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